10 Weird Health Theories That Just Won't Go Away

Last Updated Aug 2, 2011 9:56 AM EDT

Do vitamins prevent or increase the risk of developing prostate cancer? Is there really an obesity epidemic or is it just scaremongering? Are drug companies ignoring a cheap cure for multiple sclerosis? And is there anything that low doses of naltrexone cannot do?

The web allows weird theories about health to spread at lightning speed. The general public is not well-versed in the difference between science and speculation. And, of course, research sometimes does overturn long-held beliefs in favor of new facts.

Here are 10 of the strangest current theories about health and disease. All of them have, at some point, been taken seriously by educated people.

Start gallery of weird health theories»